Cheap Flights from St Louis to Seattle (STL to SEA)

Swap the Gateway Arch views for the iconic Pacific Northwest skyline with flights from St Louis to Seattle on Globitude Travels. Whether you are traveling for business, a coffee-fueled weekend getaway, or exploring Pike Place Market, we bring you great deals across major carriers. Book your St Louis to Seattle journey today and start planning your perfect West Coast trip.

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Fly from St Louis to Seattle with Ease

Departing from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) connects the Midwest to the vibrant Pacific Northwest. Key airlines operating on this route include Delta Air Lines, American Airlines, Alaska Airlines, United Airlines, Southwest, and Frontier, offering a range of options from direct flights to convenient single-stop connections.

Once you touch down in Seattle, you will find a city famous for its mild, maritime climate, stunning mountain backdrops, and rich culinary scene. Be sure to explore iconic neighborhoods like Capitol Hill, Ballard, and Belltown, where you can sample fresh seafood, world-class coffee, and artisanal foods. Reliable light rail transit makes getting from SEA airport to downtown quick and affordable.

Money-saving tips for this route

Consider flying mid-week on Tuesdays or Wednesdays to secure lower rates across carriers like Delta Air Lines and American Airlines.
Compare baggage policies across airlines like Southwest and Alaska Airlines before choosing your ticket to avoid unexpected fees.
Ride the Link Light Rail from Seattle-Tacoma International Airport straight to downtown Seattle to save money on taxi fares.
Set up fare alerts on Globitude Travels to lock in low rates as soon as prices drop for the STL to SEA route.

Frequently asked questions

Which airlines offer flights from St Louis to Seattle?

You can fly from St Louis (STL) to Seattle (SEA) with Delta Air Lines, American Airlines, Alaska Airlines, United Airlines, Southwest, and Frontier.

What are the primary airports for this flight route?

Flights depart from St. Louis Lambert International Airport (STL) in Missouri and land at Seattle-Tacoma International Airport (SEA) in Washington state.

When is generally the cheapest time to book flights to Seattle?

Booking your flight three to six weeks in advance, particularly for shoulder seasons like spring or autumn, generally offers lower prices than peak summer travel.

Are there nonstop flights available between STL and SEA?

Yes, select carriers offer nonstop service on this route, while others provide simple one-stop connections through major hubs.

Can I book my St Louis to Seattle flight over the phone?

Yes, you can contact Globitude Travels directly to speak with a travel representative and complete your reservation over the phone.

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Globitude Travels is an independent travel agency — call 1-856-513-6369 or use the search above to compare live fares on this route. See our terms, privacy policy, refund policy and service fees for full details, or contact us any time.

Page updated August 14, 2026 · fare data refreshed automatically from live flight searches.